linux-kernel - Re: [PATCH 1/2] clk: Fix error handling in fixed clock hardware type register fn

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Date:	Tue, 20 Mar 2012 08:19:57 +0100
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Saravana Kannan <skannan@...eaurora.org>
Cc:	Mike Turquette <mturquette@...aro.org>,
	Arnd Bergman <arnd.bergmann@...aro.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org, Andrew Lunn <andrew@...n.ch>,
	Rob Herring <rob.herring@...xeda.com>,
	Russell King <linux@....linux.org.uk>,
	Jeremy Kerr <jeremy.kerr@...onical.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Paul Walmsley <paul@...an.com>,
	Shawn Guo <shawn.guo@...escale.com>,
	Jamie Iles <jamie@...ieiles.com>,
	Richard Zhao <richard.zhao@...aro.org>,
	Magnus Damm <magnus.damm@...il.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Linus Walleij <linus.walleij@...ricsson.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Amit Kucheria <amit.kucheria@...aro.org>,
	Deepak Saxena <dsaxena@...aro.org>,
	Grant Likely <grant.likely@...retlab.ca>
Subject: Re: [PATCH 1/2] clk: Fix error handling in fixed clock hardware type
 register fn

On Mon, Mar 19, 2012 at 08:38:25PM -0700, Saravana Kannan wrote:
> If memory allocation for the parents array or the parent string fails, then
> fail the registration immediately instead of calling clk_register and
> hoping it fails there.
> 
> Return -ENOMEM on failure.
> 
> Signed-off-by: Saravana Kannan <skannan@...eaurora.org>
> Cc: Mike Turquette <mturquette@...aro.org>
> Cc: Andrew Lunn <andrew@...n.ch>
> Cc: Rob Herring <rob.herring@...xeda.com>
> Cc: Russell King <linux@....linux.org.uk>
> Cc: Jeremy Kerr <jeremy.kerr@...onical.com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Arnd Bergman <arnd.bergmann@...aro.org>
> Cc: Paul Walmsley <paul@...an.com>
> Cc: Shawn Guo <shawn.guo@...escale.com>
> Cc: Sascha Hauer <s.hauer@...gutronix.de>
> Cc: Jamie Iles <jamie@...ieiles.com>
> Cc: Richard Zhao <richard.zhao@...aro.org>
> Cc: Saravana Kannan <skannan@...eaurora.org>
> Cc: Magnus Damm <magnus.damm@...il.com>
> Cc: Mark Brown <broonie@...nsource.wolfsonmicro.com>
> Cc: Linus Walleij <linus.walleij@...ricsson.com>
> Cc: Stephen Boyd <sboyd@...eaurora.org>
> Cc: Amit Kucheria <amit.kucheria@...aro.org>
> Cc: Deepak Saxena <dsaxena@...aro.org>
> Cc: Grant Likely <grant.likely@...retlab.ca>
> ---
> There are still some memory free issues when clk_register() fails, but I will
> fix it when I fixed the other register() fns to return ENOMEM of alloc
> failure instead of a NULL.
> 
>  drivers/clk/clk-fixed-rate.c |   10 +++++++---
>  1 files changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/clk/clk-fixed-rate.c b/drivers/clk/clk-fixed-rate.c
> index 90c79fb..6423ae9 100644
> --- a/drivers/clk/clk-fixed-rate.c
> +++ b/drivers/clk/clk-fixed-rate.c
> @@ -61,22 +61,26 @@ struct clk *clk_register_fixed_rate(struct device *dev, const char *name,
>  		parent_names = kmalloc(sizeof(char *), GFP_KERNEL);
>  
>  		if (! parent_names)
> -			goto out;
> +			goto fail_ptr;
>  
>  		len = sizeof(char) * strlen(parent_name);
>  
>  		parent_names[0] = kmalloc(len, GFP_KERNEL);
>  
>  		if (!parent_names[0])
> -			goto out;
> +			goto fail_str;
>  
>  		strncpy(parent_names[0], parent_name, len);
>  	}

It's easier to add a char *parent to struct clk_fixed and pass it to
clk_register with &fixed->parent. This saves you a kmalloc call and
makes the error path simpler. It's the same way already done in the
divider.

Sascha

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